feat: moved LLMConfigs from User to SearchSpaces

- RBAC soon??
- Updated various services and routes to handle search space-specific LLM preferences.
- Modified frontend components to pass search space ID for LLM configuration management.
- Removed onboarding page and settings page as part of the refactor.

surfsense_backend/app/schemas/llm_config.py

@@ -1,4 +1,3 @@
-import uuid
 from datetime import datetime
 from typing import Any
 
@@ -30,7 +29,9 @@ class LLMConfigBase(BaseModel):
 
 
 class LLMConfigCreate(LLMConfigBase):
-    pass
+    search_space_id: int = Field(
+        ..., description="Search space ID to associate the LLM config with"
+    )
 
 
 class LLMConfigUpdate(BaseModel):
@@ -56,6 +57,6 @@ class LLMConfigUpdate(BaseModel):
 class LLMConfigRead(LLMConfigBase, IDModel, TimestampModel):
     id: int
     created_at: datetime
-    user_id: uuid.UUID
+    search_space_id: int
 
     model_config = ConfigDict(from_attributes=True)